linux-kernel - Re: [PATCH] jump_label: jump

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Message-ID: <20111202124558.GB1295@cmpxchg.org>
Date:	Fri, 2 Dec 2011 13:45:58 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	rostedt@...dmis.org
Subject: Re: [PATCH] jump_label: jump_label for boot options.

On Fri, Dec 02, 2011 at 10:24:10AM +0100, Peter Zijlstra wrote:
> On Fri, 2011-12-02 at 09:22 +0900, KAMEZAWA Hiroyuki wrote:
> > 
> > Yes, that's an idea. But we also have another stupid shadow swap accounting
> > table.  This can be disabled at boot, too. 
> 
> Bah I thought it was just the page frame thing, hnaz any plans to kill
> this swap array as well?

I haven't looked at the swap accounting at all yet, sorry.  But where
did this discussion go all of a sudden? :-)

That array is not allocated at all when the memory controller is
disabled at boot-time.

Rather, we have those mem_cgroup_disabled() conditionals everytime we
enter the memory controller from the VM and the idea is to patch them
out during boot, since you can not re-enable the thing anyway.
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